28149701 has 2 divisors, whose sum is σ = 28149702. Its totient is φ = 28149700.

The previous prime is 28149683. The next prime is 28149703. The reversal of 28149701 is 10794182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 10719076 = 4175^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 28149701 - 2¹⁰ = 28148677 is a prime.

It is a Sophie Germain prime.

Together with 28149703, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28149703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14074850 + 14074851.

It is an arithmetic number, because the mean of its divisors is an integer number (14074851).

Almost surely, 2^28149701 is an apocalyptic number.

It is an amenable number.

28149701 is a deficient number, since it is larger than the sum of its proper divisors (1).

28149701 is an equidigital number, since it uses as much as digits as its factorization.

28149701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 28149701 is about 5305.6291804083. The cubic root of 28149701 is about 304.1991027480.

The spelling of 28149701 in words is "twenty-eight million, one hundred forty-nine thousand, seven hundred one".